LT4356-1/LT4356-2 - Surge Stopper

Features

• Click Here For LT4356 Evaluation Kit
• Stops High Voltage Surges
• Adjustable Output Clamp Voltage
• Overcurrent Protection
• Wide Operation Range: 4V to 80V
• Reverse Input Protection to –60V
• Low 7μA Shutdown Current, LT4356-1
• Adjustable Fault Timer
• Controls N-channel MOSFET
• Shutdown Pin Withstands –60V to 100V
• Fault Output Indication
• Guaranteed Operation to 125°C
• Auxiliary Amplifier for Level Detection Comparator or Linear Regulator Controller
• Available in (4mm × 3mm) 12-Pin DFN, 10-Pin MSOP or 16-Pin SO Packages

Typical Application

Description

The LT4356 surge stopper protects loads from high voltage transients. It regulates the output during an overvoltage event, such as load dump in automobiles, by controlling the gate of an external N-channel MOSFET. The output is limited to a safe value thereby allowing the loads to continue functioning. The LT4356 also monitors the voltage drop between the V_CC and SNS pins to protect against overcurrent faults. An internal amplifier limits the current sense voltage to 50mV. In either fault condition, a timer is started inversely proportional to MOSFET stress. If the timer expires, the FLT pin pulls low to warn of an impending power down. If the condition persists, the MOSFET is turned off. After a cool down period, the GATE pin pulls up turning on the MOSFET again.

The auxiliary amplifier may be used as a voltage detection comparator or as a linear regulator controller driving an external PNP pass transistor.

Back-to-back FETs can be used in lieu of a Schottky diode for reverse input protection, reducing voltage drop and power loss. A shutdown pin reduces the quiescent current to less than 7μA for the LT4356-1 during shutdown. The LT4356-2 differs from the LT4356-1 during shutdown by reducing the quiescent current to 60μA and keeping alive the auxiliary amplifier for uses such as an undervoltage lockout or always-on regulator.

Packaging

MS-10, SO-16

Order Info

• Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
• Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
• Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)*	RoHS Data
LT4356CDE-1	DFN	12	C	$2.83	$1.98	View
LT4356CDE-1#PBF	DFN	12	C	$2.83	$1.98	View
LT4356CDE-1#TRPBF	DFN	12	C		$2.08	View
LT4356CDE-2	DFN	12	C	$2.83	$1.98	View
LT4356CDE-2#PBF	DFN	12	C	$2.83	$1.98	View
LT4356CDE-2#TRPBF	DFN	12	C		$2.08	View
LT4356CDE-3#PBF	DFN	12	C	$2.83	$1.98	View
LT4356CDE-3#TRPBF	DFN	12	C		$2.04	View
LT4356CMS-1	MSOP	10	C	$2.83	$1.98	View
LT4356CMS-1#PBF	MSOP	10	C	$2.83	$1.98	View
LT4356CMS-1#TRPBF	MSOP	10	C		$2.04	View
LT4356CMS-3#PBF	MSOP	10	C	$2.83	$1.98	View
LT4356CMS-3#TRPBF	MSOP	10	C		$2.04	View
LT4356CS-1#PBF	SO	16	C	$2.83	$1.98	View
LT4356CS-1#TRPBF	SO	16	C		$2.04	View
LT4356CS-2#PBF	SO	16	C	$2.83	$1.98	View
LT4356CS-2#TRPBF	SO	16	C		$2.04	View
LT4356CS-3#PBF	SO	16	C	$2.83	$1.98	View
LT4356CS-3#TRPBF	SO	16	C		$2.04	View
LT4356HDE-1	DFN	12	H	$3.70	$2.59	View
LT4356HDE-1#PBF	DFN	12	H	$3.70	$2.59	View
LT4356HDE-1#TRPBF	DFN	12	H		$2.69	View
LT4356HDE-2	DFN	12	H	$3.70	$2.59	View
LT4356HDE-2#PBF	DFN	12	H	$3.70	$2.59	View
LT4356HDE-2#TRPBF	DFN	12	H		$2.69	View
LT4356HDE-3	DFN	12	H	$3.70	$2.59	View
LT4356HDE-3#PBF	DFN	12	H	$3.70	$2.59	View
LT4356HDE-3#TRPBF	DFN	12	H		$2.65	View
LT4356HMS-1	MSOP	10	H	$3.70	$2.59	View
LT4356HMS-1#PBF	MSOP	10	H	$3.70	$2.59	View
LT4356HMS-1#TRPBF	MSOP	10	H		$2.65	View
LT4356HMS-3#PBF	MSOP	10	H	$3.70	$2.59	View
LT4356HMS-3#TRPBF	MSOP	10	H		$2.65	View
LT4356HS-1#PBF	SO	16	H	$3.70	$2.59	View
LT4356HS-1#TRPBF	SO	16	H		$2.65	View
LT4356HS-2#PBF	SO	16	H	$3.70	$2.59	View
LT4356HS-2#TRPBF	SO	16	H		$2.65	View
LT4356HS-3#PBF	SO	16	H	$3.70	$2.59	View
LT4356HS-3#TRPBF	SO	16	H		$2.65	View
LT4356IDE-1	DFN	12	I	$3.39	$2.38	View
LT4356IDE-1#PBF	DFN	12	I	$3.39	$2.38	View
LT4356IDE-1#TRPBF	DFN	12	I		$2.48	View
LT4356IDE-2	DFN	12	I	$3.39	$2.38	View
LT4356IDE-2#PBF	DFN	12	I	$3.39	$2.38	View
LT4356IDE-2#TRPBF	DFN	12	I		$2.48	View
LT4356IDE-3#PBF	DFN	12	I	$3.40	$2.38	View
LT4356IDE-3#TRPBF	DFN	12	I		$2.44	View
LT4356IMS-1	MSOP	10	I	$3.39	$2.38	View
LT4356IMS-1#PBF	MSOP	10	I	$3.39	$2.38	View
LT4356IMS-1#TRPBF	MSOP	10	I		$2.44	View
LT4356IMS-3#PBF	MSOP	10	I	$3.40	$2.38	View
LT4356IMS-3#TRPBF	MSOP	10	I		$2.43	View
LT4356IS-1#PBF	SO	16	I	$3.39	$2.38	View
LT4356IS-1#TRPBF	SO	16	I		$2.44	View
LT4356IS-2#PBF	SO	16	I	$3.40	$2.38	View
LT4356IS-2#TRPBF	SO	16	I		$2.44	View
LT4356IS-3#PBF	SO	16	I	$3.40	$2.38	View
LT4356IS-3#TRPBF	SO	16	I		$2.44	View
LT4356MPMS-1	MSOP	10	MP	$8.49	$5.94	View
LT4356MPMS-1#PBF	MSOP	10	MP	$8.49	$5.94	View
LT4356MPMS-1#TR	MSOP	10	MP		$6.00	View
LT4356MPMS-1#TRPBF	MSOP	10	MP		$6.00	View
LT4356MPS-1	MSOP	10	MP	$8.49	$5.94	View
LT4356MPS-1#PBF	SO	16	MP	$8.49	$5.94	View
LT4356MPS-1#TR	SO	16	MP		$6.00	View
LT4356MPS-1#TRPBF	SO	16	MP		$6.00	View
LT4356MPS-2	SO	16	MP	$8.49	$5.94	View
LT4356MPS-2#PBF	SO	16	MP	$8.49	$5.94	View
LT4356MPS-2#TR	SO	16	MP		$6.00	View
LT4356MPS-2#TRPBF	SO	16	MP		$6.00	View
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^* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Evaluation Kits

Part Number	Description	Price
DC1018B-A	LT4356-1 | Overvoltage Protection Regulator with Auto-retry	$50.00
DC1018B-B	LT4356-2 | Overvoltage Protection Regulator with Auto-retry, Aux Amplifier remains on during Shutdown	$50.00
DC1018B-C	LT4356-3 | Overvoltage Protection Regulator with Latch-Off	$50.00
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Applications

• Automotive/Avionic Surge Protection
• Hot Swap/Live Insertion
• High Side Switch for Battery Powered Systems
• Intrinsic Safety Applications

Simulate

LTSpice / SwitcherCAD III is a powerful FREE circuit simulator and schematic capture program, providing macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

• Step 1. If you do not already have a copy of LTSpice, click here to download and install LTSpice / SwitcherCAD III
  
  
• Step 2. Once LTSpice is installed, click here for a ready to run  demonstration circuit of the LT4356-1.
  
  
• Step 3. If LTspice / SwitcherCAD III does not automatically open after clicking the above link, you can instead run the simulation by right clicking on the link and selecting “Save Target As”. After saving the file to your computer, start LTSpice and open the demonstartion circuit by selecting "Open" from the "File" menu.